Swab-valve.



W. F. STAGGERS, IR;

SWAB VALVE. APPLICATION FILED APR. 29,1916.

1,191.,845. Patented July 18, 1916.

WFETABBEREJR.

UNITED STATES PATENT OFFICE.

WILLIAM F. STAG-GEES, JR, OF MANNING-TON, WEST VIRGINIA.

SWAB-VALVE.

. To all whom, it may concern:

at Mannington, in the county of Marion and State of West Virginia, have invented new and useful Improvements in Swab-Valves, of which the following is a specification.

This invention relates to oil well swabs and more particularly to a swab valve adapted to open and relieve the swab when the weight of the oil above the swab becomes more than a predetermined amount.

The swabs now in general use for bailing oil wells have but one valve in the form of a check so that it is difficult to bail an equal amount of oil on each reciprocation of'the swab and at times the swab will admit more oil above it than it can bail, which usually takes considerable time to remove. It is the object of this inventio. to provide a relief valve in addition to the, check valve in the swab which will allow l e swab to bail uniformly and relieve an] additional weight above the swab.

While the preferred form of this invention is illustrated upon the accompanying sheet of drawing, yet it is: to be understood that minor detail changes may be made without departing from the scope thereof.

The figure is a central, sectional view of this improved device, illustrating in dotted lines the valve in the relief position.

The usual swab construction includes a central, depending tube through which the oil enters and in carrying out this invention a combined check and relief valve is mounted in a tubular casing 1 adapted to be threaded on the end of the swab 2. The

upper portion of the casing is slightly enlarged and is provided with an internal shoulder 3 at the lower termination of the enlargement 4. The sides of the casing are provided with a plurality of elongated, longitudinal passgsgeways 5 for the passage of oil in both directions. The lower end of the casing is screw-threaded and is closed by threaded cap 6 preferably having a central opening therethrough.

A check valve seat 7 is slidably mounted within the casing and is adapted to seat against the internal shoulder 3. A check valve 8 is mounted to seat upon the upper surface of the seat 7 with a depending threaded stem 9 passing through a guide 10 spaced apart from and carried upon the under side of the valve seat 7 having a portlon extending to the sides of the casing for gulding the seat 7 and cut out for the passage of oil therethrough. The stem 9 is provided with an adjustable stop nut 11' for limiting the upward movement of the check valve 8, so that whenopen the check valve will assume a position about the middle of the enlarged portion 4 of the casing.

A coil spring 12 is arranged between the seat guide 10 and bottom casing closure 6 normally maintaining the check valve seat in seated engagement with the shoulder 3. The tension of this spring may be regulated by adjustment of the bottom closure 6, so that when the weight of oil above the swab upon an upward stroke thereof is greater than a predetermined amount the check valve and check valve seat will be depressed and act as a relief valve for the swab. The tops of the longitudinal openings preferably Specification of Letters Patent. Patented July 18, 1916 Application filed April .29, 1916. Serial No. 94,444. i i

terminate at the bottom of the seat 7 so that relief valve therefor comprising a casing carried upon the swab having passageways in the walls thereof and an internal shoulder thereabove, a check valve seat slidably mounted within the casing, a check valve thereabove having a depending stem, a spaced apart guide carried upon the under side of the seat guiding the stem and seat, a stop upon'the valve stem below -the guide, and an adjustable spring between the guide and bottom of the casing normally maintaining the check valve seat in seated engagement with the shoulder and allowing a movement thereof to uncover the casing wall passageways upon excessive weight above the check valve.

WILLIAM F. s raeonns, JR.

Witnesses:

MINDA E. Moons, LANGDON Moons. 

